Sipex Corporation SPX3940AM3, SPX3940AM3-3.3, SPX3940AM3-5.0, SPX3940AR, SPX3940AR-3.3 Datasheet

	SPX3940/41/42
	1A Low Drop Out Voltage Regulator
	with Shutdown
	(PRELIMINARY INFORMATION)
FEATURES	APPLICATIONS
• Output Accuracy 3.3V, @ 1A Output	• Battery Powered Systems
• Very Low Quiescent Current	• Cordless Telephones
• Low Dropout Voltage	• Radio Control Systems
• Extremely Tight Load And Line Regulation	• Portable/Palm Top/Notebook Computers
• Very Low Temperature Coefficient	• Portable Consumer Equipment
• Current & Thermal Limiting	• Portable Instrumentation
• Error Flag Warns Of Output Dropout	• Automotive Electronics
	• SMPS Post-Regulator
	• Voltage Reference

PRODUCT DESCRIPTION

The SPX3940/41/42 is a low power voltage regulator. This device is an excellent choice for battery-powered applications such as cordless telephones, radio control systems and portable computers. The SPX3940/41/42 features very low quiescent current (100 A Typ.) and very low dropout voltage. This includes a tight initial tolerance of 1% max and 2% max., and very low output temperature coefficient, making the SPX3940/41/42 useful as a low-power voltage reference.

The error flag output feature is used as power-on reset for warning of a low output voltage, due to a falling voltage input of batteries. Another feature is the logic-compatible shutdown input which enables the regulator to be switched on and off. The SPX3940/41/42 is offered in 3-pin and 5-pin TO-220 package SOT-223, and surface mount TO-263 packages.

The regulator output voltage (of the 8-pin SO-8 and 5-pin TO-220 & TO-263) may be pin-strapped for a 3.3V or programmed from 1.24V to 29V with an external pair of resistors.

TO-263-5 Package

SPX3941/42

1 2 3 4 5

Top View

Five Lead Package Pin Functions:

	SPX3941	SPX3942
1)	ERROR	ADJUST
2)	INPUT	SHUTDOWN
3)	GND	GND
4)	OUTPUT	INPUT
5)	SHUTDOWN	OUTPUT

PIN CONNECTIONS
TO-220-5 Package	SOT-223 Package
	SPX3940
SPX3941/42	1	2	3
	V	GND/ V
	IN	ADJ	OUT
	Front View
	TO-252 Package

1 2	3 4 5
Top View		SPX3940	3
			2
			1

Front View

TO-220 Package
SPX3940	VOUT
	GND/ ADJ
	VIN
Front View

TO-263Package

	VOUT	SPX3940
	ADJ/GND
	VIN

Front View

3 VOUT

2 GND/ ADJ

1 V IN

Rev. 12/19/00

SPX3940/41/42

ABSOLUTE MAXIMUM RATINGS

Power Dissipation..........................................	Internally Limited
Lead Temp. (Soldering, 5 Seconds) ................................	260°C
Storage Temperature Range ..............................	-65° to +150°C
Operating Junction Temperature Range (Note 9)
SPX3940/41/42......................................	-40C° to +125°C

Input Supply Voltage ...................................................	+7.5V
Feedback Input Voltage ..................................	-1.5V to +30V
Shutdown Input Voltage..................................	-0.3V to +30V
Error Comparator Output ................................	-0.3V to +30V
ESD Rating ............................................................	2KV Min

ELECTRICAL CHARACTERISTICS at VS=±15V,TA=25°C, unless otherwise specified. Boldface applies over the full operating temperature range.

PARAMETER		CONDITIONS	Typ.	SPX3940A			SPX3940/41		UNITS
		(Note 2)		Min		Max	Min	Max
3.3V Version
Output Voltage		-40°C ≤TJ ≤+125°C	3.3	3.267		3.333	3.234	3.366	V
			3.3	3.217		3.382	3.185	3.415
		1mA ≤IL ≤ 1A
All Voltage Options
Output Voltage			20			100		150	ppm/°C
Temperature Coefficient		(Note 1)
Line Regulation ( Note 3)		6V ≤ VIN ≤30V (Note 4)	20			40		60	mV
Load Regulation ( Note 3 )		IL = 50mA to 1mA	35			50		50	mV
						80		80
Output Noise Voltage		BV = 10Hz – 100kHz							V(rms)
		IL = 5mA	150
Ground Current		4.5V<Vin<5.5V	10			15		15	mA
		IL = 5mA				20		20
		Vin=5V				200		200
		IL = 1A	110			250		250
Current Limit		VOUT = 0	1.7	1.2			1.2		A
Thermal Regulation			0.05			0.2		0.2	%/w
Dropout Voltage (Note 5)		IL = 1A	0.5			0.8		0.8	V
						1.0		1.0
		IL = 100mA	110			150		150
						200		200
Adjustable Versions only			Typ				SPX3940/42
Reference Voltage			1.235				1.200	1.270	V
							1.98	1.272
Reference Voltage		Over Temperature					1.185	1.285	V
		(Note 6)
Feedback Pin Bias Current			20					60	nA
								80
Reference Voltage		(Note 7)	50						ppm/°C
Temperature Coefficient
Feedback Pin Bias Current			0.1						nA/°C
Temperature Coefficient

Rev. 12/19/00

SPX3940/41/42

(Continued)

PARAMETER	CONDITIONS	Typ.		SPX3940/42		UNITS
	(Note 2)		Min		Max
Output Leakage Current	V0H = 30V	0.01			1.00	A
					2.00
Output Low Voltage	VIN = 4.5V	150			250	mV
	I0L = 400 A				400
Upper Threshold Voltage	(Note 8)	60	40			mV
			25
Lower Threshold Voltage	(Note 8)	75			95	mV
					140
Hysteresis	(Note 8)	15				mV
Input logic Voltage	Low (Regulator ON)					V
	High (Regulator OFF)	1.3	2.0		0.7
Shut down Pin Input Current	VS = 2.4V	30			90	A
					150
	VS = 30V	450			800
					1000
Regulator Output Current in		3			15	A
Shutdown					25

Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.

Note 2: Unless otherwise specified all limits are guaranteed for Tj = 25°C, VIN = 6V, IL = 100 A and CL = 1 F. Additional conditions for the 8-pin versions are

feedback tied to 5V tap and output tied to output sense (VOUT = 5V) and VSHUTDOWN ≤ 0.8V.

Note 3: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specification for thermal regulation.

Note 4: Line regulation for the SPX3940/41/42 is tested at 150°C for IL = 1 mA. For IL = 100 A and TJ = 125°C, line regulation is guaranteed by design to 0.2%. See typical performance characteristics for line regulation versus temperature and load current.

Note 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value measured at 1V differential at very low values of programmed output voltage, the minimum input supply voltage of 2V ( 2.3V over temperature) must be taken into account.

Note 6: VREF ≤VOUT ≤ (Vin - 1V), 2.3 ≤Vin≤30V, 100 A≤IL≤ 250 mA, TJ ≤ TJMAX.

Note 7: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at 6V input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = VOUT/VREF = (R1 + R2)/R2. For example, at a programmed output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95 mV x 5V/1.235 = 384 mV. Thresholds remain constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed.

Note 8: VSHUTDOWN ≥ 2V, VIN ≤ 30V, VOUT =0, Feedback pin tied to 5V Tap.

Note 9: The junction -to-ambient thermal resistance of the TO-92 package is 180°C/ W with 0.4” leads and 160°C/ W with 0.25” leads to a PC board.

The thermal resistance of the 8-Pin DIP package is 105°C/W junction-to-ambient when soldered directly to a PC board. Junction-to-ambient thermal resistance for the SOIC (S) package is 160°C/W.

Rev. 12/19/00